#include <iostream>//IO输入输出流相关
#include <string>//C++
#include <cstring>//C
#include <cstddef>//size_t
#include <vector>//内置模版容器

using namespace std;//命名空间

int main()
{
    string s("John_Tian 2013.9.3");
	cout<<s<<endl;//输出原始字符串

	string::iterator it=s.begin();
	 //convert first word in s to uppercase
	 while (it!=s.end()&&!isspace(*it))//isspace()判断是否为空格
	 {
		 *it=toupper(*it);//toupper把对应字母变换为大写
		 ++it;
	 }
	 cout<<s<<endl;//输出首写字母转换后字符串

	 const size_t array_size=5;//数组大小常量，类型为const size_t
	 int a[array_size]={0,1,2,3,4};

	 for (size_t ix=0;ix!=array_size;++ix)//前置++
	 {
		 cout<<a[ix]<<endl;
	 }
     cout<<"①"<<endl;
	 for (size_t iy=0;iy!=array_size;iy++)//后置++
	 {
		 cout<<a[iy]<<endl;
	 }
     cout<<"②"<<endl;
	 return 0;
}